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Research and Design of Temperature Controlling System of Infrared Therapy Instrument

Author: LiJiaPing
Tutor: TianXueLong
School: Chongqing University
Course: Biomedical Engineering
Keywords: Infrared therapy Fuzzy PID Non-contact temperature measurement Physiotherapy burns
CLC: R318.6
Type: Master's thesis
Year: 2011
Downloads: 43
Quote: 0
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Abstract


Infrared physiotherapy apparatus in the adjuvant treatment of various diseases has been widely used infrared physiotherapy instrument adjuvant treatment efficacy of various diseases has been proven in many clinical cases reported. Properly controlled infrared irradiation intensity and irradiation time, the patient is irradiated sites cause burns. Such patients while receiving treatment also produced side effects. In order to ensure better treatments and patient physiotherapy parts effectively prevent burns, a good temperature control system is necessary. But most infrared physiotherapy instrument market is not irradiated parts of the human body temperature monitoring function. Existing research, the design of the majority of the temperature control system is only for a certain kind of infrared therapy instrument design, and industrial infrared thermometer for direct purchase with output interface, the output of the data transmitted by the data acquisition card temperature measurement and control to the computer switching power supply, or power control part of physiotherapy instrument. This makes the use of high cost of infrared therapy device, use is also subject to certain restrictions. Therefore, the main contents of the paper the following aspects: (1) comparative analysis of the commonly used infrared therapy instrument characteristic infrared wavelengths as well as a variety of temperature measurement method, pointed out that the lack of contactless temperature measurement and control methods, and the use of non-contact measurement temperature of the surface of the irradiated parts temperature monitoring should pay attention to the problem. (2) for near-infrared physiotherapy apparatus and infrared therapy instrument designed a set of temperature measurement and control system. The system hardware, by the size of the zero-crossing detector and using SCR directly to the mains to control the power of the chopper, simplifying the hardware design and reduce costs. In the algorithm, the surface temperature control in the irradiated parts of the process of infrared therapy has multivariate affect, it is difficult to determine the exact model, non-contact infrared temperature measurement will produce disturbance characteristics, using fuzzy PID algorithm suitable for single-chip the higher the temperature of the control response rate and steady-state accuracy. ③ low temperature burn characteristics depending on the patient, put forward a relatively high temperature and relatively low temperature alternately infrared therapy, and this approach, experiment and explore. The experiments show that the system can be effectively avoided patients were irradiated site burns, and be able to set a different temperature depending on the illness and the treatment site, treatment regimens.

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CLC: > Medicine, health > Basic Medical > Medical science in general > Biomedical Engineering > Apparatus, equipment
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